CAIE A Level Chemistry 9701 · Atoms, molecules and stoichiometry
The Avogadro constant, L, is 6.02 × 10²³ mol⁻¹. A student has one mole of methane, , and one mole of sulfur dioxide, . The two samples contain the same number of molecules, but the sulfur dioxide has the greater mass. Suggest why this is so, in terms of the Avogadro constant and the particles present.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
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